| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Defects and Properties of Cast Metals
|
| Presentation Title |
M-53: Ni/Mn Replacement in High-Ni Austenitic Stainless Cast Steels Used for Turbo-charger |
| Author(s) |
Jisung Yoo, Won-Mi Choi, Byeong-Joo Lee, Yong-Jun Oh, Gi-Yong Kim, Sunghak Lee |
| On-Site Speaker (Planned) |
Jisung Yoo |
| Abstract Scope |
Recently, high-Ni austenitic cast steel whose brand name is a DIN 1.4849 (0.4C-2.0Mn-1.5Si-20Cr-38Ni-1.5Nb (wt.%)) has been commercially used for high-performance housings, due to its excellent strengths and thermal fatigue properties above a typical exhaust-gas temperature of 950°C. Since this steel contains 38 wt.% of Ni, a partly replacement of Ni by Mn is needed for reducing alloying costs (up to 25%) without losing high-temperature properties. When the Ni content reduces to 22 wt.%, there are no merits of high-temperature strengths as the total carbide fraction decreases. The 24%Ni-containing steel contains the highest total carbide fraction, which results in the highest high-temperature strengths. Furthermore, the initiation and propagation of microcracks are retarded by the relatively homogeneous carbide distribution due to the smallest cell size. Thus, alloy designing for enhancing the distribution and fraction of total carbides is desirable for high-temperature properties of the austenitic stainless cast steels. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |